I live in London, and I couldn't tell you what it's like on the tube or in shops; interesting to hear. But, probably you're also a software engineer working from home, so if it bothers you, how are you able to tell me?

I assume the large majority of tube users are the non compliant, simply because so few of the compliant have any reason to actually need to use the tube, so your 50% doesn't surprise me at all, certainly not that it's low.